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Molecular Basis of Inheritance · Question 112

AIPMT 2010 (Mains)MCQEasy📈 Topic in 75% papers+4−1
1

The 3'-5' phosphodiester linkages inside a polynucleotide chain serve to join -

  1. One nucleotide with another nucleotide
  2. One nitrogenous base with pentose sugar
  3. One nucleoside with another nucleoside
  4. One DNA strand with the other DNA strand

Answer

(1) One nucleotide with another nucleotide

Solution

As per NCERT, two nucleotides are linked through a 3'-5' phosphodiester linkage to form a dinucleotide; more nucleotides joined this way form a polynucleotide chain.

⇒ The base is joined to the pentose sugar by an N-glycosidic linkage, and the two DNA strands are held by hydrogen bonds.

Answer: (1)

AIPMT 2010 (Mains)

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2

The lac operon consists of -

  1. Three regulatory genes and three structural genes
  2. Four regulatory genes only
  3. Two regulatory genes and two structural genes
  4. One regulatory gene and three structural genes
AIPMT 2010 (Mains)
3

In eukaryotic cell transcription, RNA splicing and RNA capping take place inside the -

  1. Dictyosomes
  2. Ribosomes
  3. Nucleus
  4. ER
AIPMT 2010 (Mains)
4

Which one of the following statements about the particular entity is true?

  1. Nucleosome is formed of nucleotides
  2. Centromere is found in animal cells, which produces aster during cell division
  3. The gene for producing insulin is present in every body cell
  4. DNA consists of a core of eight histones
AIPMT 2010 (Mains)
5

Which one of the following does not follow the central dogma of molecular biology ?

  1. Mucor
  2. HIV
  3. Chlamydomonas
  4. Pea
AIPMT 2010 (Prelims)
6

The one aspect which is not a salient feature of genetic code, is its being –

  1. Specific
  2. Degenerate
  3. Ambiguous
  4. Universal
AIPMT 2010 (Prelims)
7

Select the two correct statements out of the four (A–D) statements given below about lac operon. The correct statements are :

  1. B and D
  2. A and B
  3. B and C
  4. A and C
AIPMT 2010 (Prelims)
8

Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a "triplet"?

  1. Nirenberg and Matthaei
  2. Morgan and Sturtevant
  3. Hershey and Chase
  4. Beadle and Tatum
AIPMT 2009
9

Semi-conservative replication of DNA was first demonstrated in:

  1. Drosophila melanogaster
  2. Streptococcus pneumoniae
  3. Salmonella typhimurium
  4. Escherichia coli
AIPMT 2009
10

Removal of introns and joining the exons in a defined order in a transcription unit is called:

  1. Transformation
  2. Capping
  3. Splicing
  4. Tailing
AIPMT 2009
11

What is not true for genetic code?

  1. It is nearly universal
  2. A codon in mRNA is read in a noncontiguous fashion
  3. It is degenerate
  4. It is unambiguous
AIPMT 2009

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